从Android相机捕获的照片是完全黑色的 [英] Photos captured from Android camera are completely black

问题描述

我制作相机并尝试拍摄照片。由于原始数据是YUV，我使用函数将其转换为RGB：

I make a camera and try to capture a picture. Since the original data is YUV, I turn it into RGB using function:

static public void decodeYUV420SP(byte[] rgbBuf, byte[] yuv420sp,int width, int height)

但是，保存的照片是完全黑色的没有内容。

However, the photo saved is completely black, there is no content in it.

我也找到了以下方式：

mBitmap = BitmapFactory.decodeByteArray(data, 0, data.length);

但项目已关闭。

有没有其他有效的方法来保存照片？谢谢！

Are there any other effective ways to save a photo? Thank you!

推荐答案

一个旧帖子，但它说的是一个类似的问题，我知道：）

An old post, but it speaks of a similar problem that I have so I might as well answer the part I know :)

你可能做错了。我建议您使用JPEG回调来存储图像：

You're probably doing it wrong. I suggest you use the JPEG callback to store the image:

mCamera.takePicture(null, null, callbackJPEG);

这样，您就可以将JPEG数据导入到可以存储到文件中的例程中：

This way you will get JPEG data into the routine which you can store into a file unmodified:

final Camera.PictureCallback mCall = new Camera.PictureCallback()
{
  @Override
  public void onPictureTaken(byte[] data, Camera camera)
  {
    //Needs <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
    File sdCard = Environment.getExternalStorageDirectory();
    File file = new File(sdCard, "pic.jpg");
    fil = new FileOutputStream(file);
    fil.write(data);
    fil.close();          
  }
}

至于黑色图片，在 camera.startPreview（）和相机之间放置一个简单的 Thread.sleep（250） .takePicture（）负责处理Galaxy Nexus上的特定问题。
我不知道为什么这个延迟是必要的。即使我添加 camera.setOneShotPreviewCallback（）并调用 camera.takePicture（）从回调，图像出来黑色如果我不第一次延迟...
哦，和延迟不只是一些延迟。它必须是一些很长的价值。例如， 250ms 有时会工作，有时不会在我的手机上。

As far as the black picture goes, I have found that placing a simple Thread.sleep(250) between camera.startPreview() and camera.takePicture() takes care of that particular problem on my Galaxy Nexus. I have no idea why this delay is necessary. Even if I add camera.setOneShotPreviewCallback() and call camera.takePicture() from the callback, the image comes out black if I don't first delay... Oh, and the delay is not just "some" delay. It has to be some pretty long value. For example, 250ms sometimes works, sometimes not on my phone.

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